
 Roman Notation  World of Mathematics 
  Roman notation is an additive (and subtractive) system of numerical notation, originally used within the ancient Roman empire that extended far past the Italian peninsula, in which letters are used to denote certain "base" numbers. 
  The seven letters (or symbols) of the Roman numeral system are I, V, X, L, C, D, and M, that stand, respectively, for 1, 5, 10, 50, 100, 500, and 1,000 in the Arabic numeral system. 
  Roman numerals are still in used today, more than 2000 years after their introduction, but only for certain limited purposes. 
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